Throttle-valve.



J. M. COFFEY.

THROTTLE VALVE.

APPLICATION FILED MAY19, 1916.

Patented Feb.13,1917.

UNITED STATES PATENT OFFICE.

JOSEPH M. COFFEY, OF NEW YORK, N. Y., ASSIGFTOR TO CHAMBERS VALVE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

THROTTLE-VALVE.

Specification of Letters Patent.

Patented Feb. 13, 1917.

Application filed May 19, 1916. Serial No. 98,666.

To all whom it may concern:

Be it known that I, JOSEPH M. CoFFEY, a

citizen of the United States, residing at Newv York, in the county of New York and State of New York, have invented certain new and useful Improvements in ThrottleValves, of which the following is a specification.

This invention relates to improvements in throttle valves and more particularly to throttle valves adapted for use on loco m0 7 will be reliable and eflicient in use and operation and in which corresponding movements of the valve away from its seatwill first cause a progressively'increasing area of opening through which the steam may pass followed by a progressively decreasing rate of increase of area. f

Other objects will be in part obvious from the annexed drawings and in part indicated in connection therewith by the following analysis of this invention.

This invention accordingly consists in the features of construction, combination of parts and in the unique relations of the members and in the relative proportioning and disposition thereof, all as more completely outlined herein.

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the same by the numerous modifications in structure and relation contemplated by this invention, drawings depicting a preferred form have been annexed as a part of this disclosure, and in such drawings, like characters of reference denote corresponding parts throughout all the views, in which- Figure 1 is a transverse vertical sectional view of the valve and valve seat, the actuating mechanism and associated arts of the valve being omitted for the sa eof clearness;

Fig. 2 is valve.

Referring now to the drawings in detail, 5 denotes-a valve member which is preferably cylindrical in form having a central opening 6 therein and in which the valve a side perspective view of the stem (not shown) is adapted to be mounted. The cylindrical part of this member is provided with a projection having a ground beveled or angularly disposed edge 7 adapted to coact with a valve seat 8. Projecting downwardly and preferably at four equally distant points about the circumference of the valve are guide wings 10 formed integral with the valve and coacting with the inner surface of the throttle box or valve seat in the usual manner. The walls of the valve member between the wings are cutaway or are shaped terminating in squared portions 12, as shown more clearly in Fig. 2. The length of the base of the arcs is much greater than their height, or, in other words, the arcs are relatively broad. This wall may be of any desired shape or curvature, but a curve of uniform radius on the cylindrical surface of the valve is preferable, it being understood that the outer surface of this wall is adapted to closely fit the inner surface of the valve seat or throttle box.

If the valve is raised but a quarter of an inch a relatively small segment of each arch will be presented to the passage of steam therethrough. If the valve is raised a half inch, approximately three times the area of valve opening will result. A further raising of the valve however will roduce a p'rogres sively decreasing rate of squared corners 12 at the end of the arc are reached, after which the rate of increase will be substantiallyv uniform. Thus a quarter inch lift will produce an area of about eleven units, two quarters a total of about 46.7 units, three quarters a total of about 80.5 and a fourth quarter about 120.4 units with a cutaway part of substantially uniform radius. This may be varied of course by changing the shape of the opening. This form of valve is particularly desirable where light movement is necessary, as when slowly increase of area a through which the steam may pass until the construction, reliable and efiicient in use and operation and does accomplish, among others, all of the objects and advantages herein set forth.

Without further analysis,.the foregoing will so fully reveal the gist of this invention that others can by applying current knowledge readily adapt it for various applications without omitting certain features that, from the standpoint of the prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalencyof the following claim.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is- In a throttle valve,in combination, a valve seat, a valve member of general cylindrical shape having an outwardly projecting angularly disposed seating surface near its upper part adapted to coact with said valve seat, a plurality of guides associated with the valve member adapted to center the valve with respect to the valve seat, the valve member comprising cut away walls between the guides forming relatively broad arcs in said walls whereby the area of, the passage between the valve and the valve seat is progressively increased for uniform movement of the valve durin the first part of the opening thereof, said valve member being provided with a central opening having a valve seat associated therewith within which a valve stem may be loosely mounted.-

In testimony whereof I afiix my signature in presence of two witnesses.

JOSEPH M. COFFEY.

Witnesses:

Fran A. KUNEMUND, ALEX. TURNER. 

